Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e635c959d0684b1…

MALICIOUS

PDF

80.8 KB Created: 2021-07-03 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e35dc48efcf7c8ea21ab3e7a4361456d SHA-1: 7fb8d22510a09c6b4f8fef9a85695c9140c6a33c SHA-256: 7e635c959d0684b1b18eeb963fa5c5e2881b189e8a70f6fdfcf020f356d44c36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an effort to obscure the ultimate malicious destination. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic further support the conclusion that this document is designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://originalcheck.it/public/img_admin/file///neredazufopezoluzosapiv.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f18987258235df587c2fed2de1e43cac/57362892160.pdf
    • http://mamtomchabahai.com/uploads/files/files/60199337195.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/136kt6rcfjvkrpmpl37gehrstr/68699548754.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097d7dea6287---25480645038.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d25dec43e1e55819967cca1d55da8d73/kuvudekusovupivexigaw.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/79ba2fb7761b778ff625768e5d6eccc6/kubokeropatud.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778aac2f73---67280618315.pdf
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/91957817888.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8be3dcd1b---fotijaripajoginofet.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3324c9a7ce---xotaramunupexejog.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6d732f6555bc6dd4a60b947b30958908/73437778524.pdf
    • http://tuzvedo.hu/elemek/file/tesasazulizilepum.pdf
    • http://cerrutistudio.eu/userfiles/files/pobutapagewiwo.pdf
    • http://hotelbelleepoque.bg/userfiles/file/jusopijakulux.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u8eecd24toctof1rll0th9jh5k/33832710640.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4407a23e34512bfe976b3b3cbeb55295/zejakuwadomorojojafibo.pdf
    • http://laxycoffee.com/upload/files/lotavod.pdf
    • https://lemanssrl.it/file/dujomidosagisut.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tllrn9pbtmucq68p72328ounec/38271507363.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/pogoz.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61e2b8e4a---direpisati.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/57218b271c3395e9e0eeaa828dcc6a09/fovikuwudolijogejojefur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=removing+lienholder+from+title
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16792 bytes
font_01_sfnt_off0000f258.bin
d5c14edceed26d14a446236dbeff4fb45c64e6742dcd0c4f95246a9ab73ccccf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16856 bytes
font_02_sfnt_off00011e67.bin
8b8de52a73cb0228bd5460fedf5df19f008c36502937debed401564b7d7301ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 10584 bytes